Office chair



FIG. 1 is a perspective view of an office chair showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is another perspective view thereof;

FIG. 8 is an enlarged view of circle A in FIG. 7;

FIG. 9 is an enlarged view of circle B in FIG. 7;

FIG. 10 is an enlarged view of circle C in FIG. 7; and,

FIG. 11 is an enlarged view of circle D in FIG. 7.

The broken line disclosure represents a portion of the office chair which forms no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 